Which of the following statements is true? which of the following statements is true?
a. in general, the solubility of a solid in water decreases with increasing temperature.
b. the solubility of an ionic solid in water decreases with increasing temperature.
c. the solubility of a gas in water usually increases with decreasing pressure. in general,
d. the solubility of a gas in water decreases with increasing temperature.
e. none of the above statements are true.

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?